Error when customising a Sharepoint 2010 list form in InfoPath 2010

– You want to the form a bit more fancy, so you click the “customize form”

Error –>

Not that obvious since the error is very misleading (we are used to that, aren’t we!) the default View or only View of your list is in DataSheet mode, just go and create a new Standard View, make it the default and now the form can be edited by InfoPath without complaining.